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Finding the Fourth Proportional to 494.64, 741.92 and 387.72

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Solution

The fourth proportional to 494.64, 741.92 and 387.72 is: 581.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    494.64 : 741.92 = 387.72 : x
  2. Step 2: Convert to fraction form
    494.64/741.92 = 387.72/x
  3. Step 3: Cross multiply
    494.64x = 741.92 × 387.72
  4. Step 4: Simplify right side
    494.64x = 287,655.28
  5. Step 5: Solve for x
    x = 287,655.28/494.64
  6. Step 6: Final answer
    x = 581.54

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.